class MyMath:
    def add(self, a, b):
        return a + b

    def minus(self, a, b):
        return a - b

    def multi(self, a, b):
        return a * b

    def div(self, a, b):
        return a / b

    def pow(self, a, b):
        return a ** b

    def sqrt(self, a):
        return a ** 0.5


my_math = MyMath()
print(my_math.add(1, 2))
print(my_math.minus(1, 2))
print(my_math.multi(1, 2))
print(my_math.div(1, 2))
print(my_math.pow(3, 2))
print(my_math.sqrt(2))


class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def introduce(self):
        print('My name is {}, my age is {}'.format(self.name, self.age))


class Student(Person):
    def __init__(self, name, age, class_no):
        super().__init__(name, age)
        self.class_no = class_no


mike = Student('Mike', 23, 1)
jame = Student('Jame', 22, 2)

mike.introduce()
jame.introduce()